Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ecaa1e66a0c08c162d58048635a44914f6e374ea7326e11805572c01fd81da' 
  AND token = 'gAU9DlZBsQKYK3pGWm3NgZ01RLB5nplLIaCAyuuqJlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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