Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6ad7a3bba59f1c46b8e411a8035d9a8d255138b4f3c3e5b223ab02d8129a2c' 
  AND token = 'Su7oZQiSCas+9Y0mVk9XSTTQ/sMl2Guec1eFtykCDZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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