Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347f141887063b5747d50213366fd3d86ee5027347314fe1df0982ea5b47f7db' 
  AND token = '4DGfGxBhw7kFnCVKZLDoVt1xKNgLGK8M32tDNAUtX54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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