Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2b5869468c695353d154248eb2314b7aacdd0c6e4e5f7ad6b1661967b95c75d9' 
  AND token = '5InRlldfPA87CnsZ5BCsKCXW1AkZHZdcaBTdoeJ19JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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