Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683920dc21d75985e92ad072001a0de15bfc439c3873e5ea7e1bd7387d879c41' 
  AND token = 'YedJXJVGjFx+TT0hV4CoSwMdLEHuPzrrVtkxCrIOzeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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