Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ac943400c6028c9cb7b2e8a3dc9c30f5dd2f24501932bbd1af7fa0baee1c31' 
  AND token = 'SaoZmQP+a1s38XAKq8ZPO4ItHWjF5HXYKcOLkFzTi2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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