fix: address PR review feedback on timing-safe token validation #895

Job	Run time
Coding Standard & Static Analysis	39s
testsuite (8.3, mysql)	55s
testsuite (8.3, sqlite)	39s
testsuite (8.5, sqlite)	48s
testsuite (8.5, pgsql)	54s
testsuite (8.2, mysql)	1m 16s
testsuite (8.4, sqlite)	51s
testsuite (8.2, sqlite)	1m 7s
testsuite (8.5, mysql)	1m 10s
testsuite (8.3, pgsql)	42s
testsuite (8.4, pgsql)	1m 15s
testsuite (8.2, pgsql)	1m 12s
testsuite (8.4, mysql)	59s
	12m 27s

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