Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de00f8e8dc826e9edf39449930a5fc6eae195e1eb39ebeba04f2b6059b45c966' 
  AND token = 'jpBaTUdYk8WtbWC04tyTn5NT8ayNLVprWaFyR2BNKsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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