SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '43453771936595a8442bc0a32d109c208e18e690cb41602964314aa7829d2b2c' 
  AND token = 'IoFNWhIwZYgVqfC8+1BBdzb7dBBZfs7H6C3c76gJYkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}