Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1368a4479d35ebf8be1a50118c9f46d4b988b27b2a2ca1b1251d1a12e0b90e9d' 
  AND token = 'YDjYiXUpa8gvjS36IA3nJcJs/EvYZx9FHEZSewcsYsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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