Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7509eb0ba41266c521e248909091ffaa7a4f474dbeb0883275a18739a7095fc7' 
  AND token = '0wfwI96XdLXQXZ7yEE9mtmS3qbhzWIRp22eGT/UzEtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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