Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0ecf2b8874833f5aea57bf9e71fd16ede7d2f3f281cc5bf4f20472ee741663aa' 
  AND token = 'jr/a9Ya8nrCLY9CwNHZlaZc5c8dUsY6ZJHViUDXXxUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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