Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99aa4bff4bdf6fba669da2e8337a8631a9c62b684a3bcef1e557933440adf714' 
  AND token = '4E3TbGPYsEHnUVn+RJekinEpUIY1HytRK4zOs62YFAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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