Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9acb20ecf17a3fb96d8f359438bc522310c49593724e62ce9ae758463e8485c2' 
  AND token = '5fyb3wih30neyOaNr7pVtskk3TDei08bW6dTnfbgBS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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