Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bd31bf6cc40afc3c961d708d7b0a56417ef122ffc90a4dff6d4ea5d5fe4bdf4' 
  AND token = '4db7kL1FXnlokpZDRmh2sh8oAWD9AO4+obRD3kj+UxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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