Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '688e1a68c566e2453ff8815fa4d8732afc41c32300a19e32f351a9c7f2c3e544' 
  AND token = 'E7DkK44oV0JefdlZwGp30KweYfn4LtKBvTvpsJvxVhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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