Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731c0056559d98ea3484adda42e3d6a1f8011ac3a41e291cae1df4087aca3e3e' 
  AND token = 'RYNfUcyOUA2RQbMZHEYCR5XxxPpFlQCFv4gD4NJ4I60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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