Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d40b7a84562ca686f8166c3d6c3861ac48f03a6c632b5a46a145f82bc0ca8f' 
  AND token = 'L3NMw7PolRI+h6nqVlFJaLpcFH/xDftI054/5RNTTZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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