Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6dbc7c9a9938a384168c274069d4a3b8a66c0c75bb78e500d3fd3e222f33a7e' 
  AND token = 'EYy5ulrxQGmmQB3jVi8tmqllz8aT0S04+42rvh5hIps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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