Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '508b2d8ce6080055c0bc3b867e8f3c83288af14269f197df150676f0c97d7b10' 
  AND token = 'd8AtpT0PFtD4b6xfFnRluQdwaaHPkyMeIXizsKHWBZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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