Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02d6cbe86a80e4dbd8ae4c298c11cfdf78fdf5953207d9db77625cbae30f2a8' 
  AND token = 'dm+mAeelyHLjUS/6gnFlFmq1GiXyEoDeDyQleaVeDEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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