Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d47d12716223a51e7dc58eb00dea575d6b24e412a35b60e9c163b144194f651' 
  AND token = 'RDqu0+PqzwphZoUZ72XRnKUE1z8PkV7+GKx4Se21mIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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