Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7f85331079a7f91de2f5fd8247e43df3ef774d15a70a8b81c0d43f5f7155dd' 
  AND token = 'U8ewGw4rU37MhA0VTWtm+KqYuf4KhPOWx8Z+ORCjDVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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