Hi Dan,
in the GUI in the search mask you find a field called Condition as well as a drop down box called Condition Mode.
If you set the Condition Mode to AND, and enter
JOB.RUN_MODE == 'PROD'
into the Condition field, it should work as desired.
It'll make sense to add some more criteria (like the MASTER ID), because parameter resolution is pretty expensive and it would take a while until that is done for all jobs stored in memory.
HTH
Ronald