/etc/freeradius/3.0/mods-config/sql/counter/mysql/expire_on_login.conf is in freeradius-config 3.0.12+dfsg-5+deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | query = "\
SELECT IFNULL( MAX(TIME_TO_SEC(TIMEDIFF(NOW(), acctstarttime))),0) \
FROM radacct \
WHERE UserName='%{${key}}' \
ORDER BY acctstarttime \
LIMIT 1;"
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