Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d504c125cfe826a30bafed1d7f3859260a44223bfe487065872446180c578f' 
  AND token = 'XQqdl5c2tz8JYS8SSLGtn0mK67iIqEgyKBAF9fzkrTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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