Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430ace4d934184a0d5c0cbda98a9c211059fdd76ec1a029b839dc578bb908942' 
  AND token = 'mXc50PGt2D3VGIazcgEo1NeJK/SYzIVzAxcU/uhcWNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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