[mysqld]
slow_query_log = 1
slow-query_log_file=/var/lib/mysql/slow_queries.log
long_query_time = 5
log_queries_not_using_indexes=1

tail -f slow_queries.log

# User@Host: ascomaxx_hawk[ascomaxx_hawk] @ localhost []
# Query_time: 0.005262  Lock_time: 0.000044 Rows_sent: 1  Rows_examined: 7535