I'm going to assume that there could be multiple emails/rows per Subject.
Here's a nice way to get a list of all the emails that match and joined by a semi-colon ready to send an email. What I'm not sure about is if you are just going to send a single email to everyone that has that Subject, or individual email to each match using the content from the Body column. I'll show both examples here.
For this example, I have the following Excel file.

Example 1 - Get a list of matching emails separated by a semi-colon.
Below is the full flow for example 1. I'll go into each of the actions.

When a new email arrives is fairly straight forward. Mine is set to wait for an email in a particular folder.

List rows present in a table get all the rows where the Subject is equal to the Subject of the email that just arrived.

The Select then takes each of the rows that were returned and outputs a simple array of emails.

If the Subject of the email was Test for Grant Jenkins (based on the example Excel Table) we would get back the following:
[
"grant.jenkins@microsoft.com",
"bob.jones@microsoft.com"
]
We can then use a Join to concatenate the emails separated by a semi-colon.

grant.jenkins@microsoft.com;bob.jones@microsoft.com
You can then add the output of your Join into your email and send to all recipients.
Example 2 - Send an individual email to each matching row taking the Body content from the Excel Table.
Below is the full flow. I'll go into each of the actions.

When a new email arrives, and List rows present in a table are the same as the previous example.

We then have an Apply to each that iterates over each of the rows that were returned.

Get a row will return each of the rows returned (one by one) using the ID field since this is the only field that can uniquely identify each row (your Table must have a column that contains unique values which it looks like it does).

Finally, we can use Send an email to email each of the users including the content from the Body column in the Excel Table. You need to make sure you only use the fields from Get a row in your email (not fields from List items present in a table).
