Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c51095ccb999adcbc7125d7fcf1c608a62059530e23a194f6c8c10fe4eab306' 
  AND token = 'kbSdBHJHnL/nMlgdMje/2yEpxzsq8reQ+LgsXKpe9dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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