Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e54b19795103374cce586fcd3c637ef61d9df87a4fd09f7adfbf85c39a774c28' 
  AND token = 'TvbQjGnBpcKZSImyDK0Hhv0YeEZj8LTmRve4mRfHDtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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