Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e7ae19a4550e38fffd8f72d1024f016a219f01731da2fc39fc0d0ef395dc00' 
  AND token = 'LslACIwStl8l9DLOpx3RxGGCLS1TXm/IFIbXt0kXnMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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