Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e1d0a11940c51aee1265f9b9be4693e65388666ddf1603e3fc580aec155c5b' 
  AND token = 'hn4H7f3/IyWb9ssmGZrddAf8+ssDMn6fhGFpWt2+rwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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