go to whatever table in your model driven app, click into a record, and copy that URL.
The end of the URL will have "entityrecord&etn=logicalnameofyourtable&id=guidoftherecordinquestion"
So, in one of many ways, get the guid of your record and put it into a hard-coded string as the OP did, or go further and make this a child flow that retrieves the environment URL, the appid, the entityrecord etn, and the record id. so that you can reuse this flow wherever you want.