As you are using the grep command to find the string from the file, why do not you use the grep's exact word matching option?
grep -RlFx 7kyJ7kSKioDTWVWeRB3TiciL1UjcmRiLn4SKiAETs90cuZlTz5mROtHWHd
/var/www/html/ > /var/scripts/problem_files.txt
From the grep man page:
Interpret PATTERN as a (list of) fixed strings
Select only those matches that exactly match the whole line.
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