Cloud Flow how to have static variable? instead of reading Excel Table every time when eMail arrive?

[SunnySchindler]

How to have static variable such that Excel Table is read once into the variable; unless the Excel has been modified ? Would this speed up Flow ?

As-Is, it is taking 16 minutes to compare eMail body ( 20 characters) with a table of only 17 rows of names. If Body contains one of the names, a eMail alert is sent.

Thanks Ahead!