Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '131b157ab7ea3a1bc5a44fb1ed1e906553cc93c2fc19f2be393a32970ab4a73f' 
  AND token = 'm/sNFgjqXDxbVboVGJfSnIsDsBc5r2B6oYcwizabiLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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