Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8386b9899252bedded05b3f2d8cb17a15b0cb853a7363b92eeff6935ec1b689d' 
  AND token = 'ez9MXXto2Rq43N3zZMPrM10bogVLCg5sFNeFLR1DpOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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