Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc713de4a147c585c8695c28090bb6920069011a70821d6ce48fe4d00a51bd5' 
  AND token = 'u5CDXw0CS3Ye8n5pxno+eY2pM02rEWpT/mG2RcRF1qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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