SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9b5d494e93bd2637d1cd0c8dbabd62dc65938a6a49fa79b84f6dfaf9b1b35b6f' 
  AND token = 'acyqHaIJDQ5BmB2rix5lC7weVVvF4xLpTOCCgGLfO+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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