Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6feaa08033ab7d6e1ead8ded2c4c850ec802a6538683e5a7cfcd97f71f56a91f' 
  AND token = 'mHQDndHaf21Wu/XCWtbMK+w54b4sDpaAPXQM89xW+uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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