Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '426378a2c23d4c115d34c758207399593c62e775d3d4c3bc00e62a4f42319c35' 
  AND token = 'QjJEMd7zOftLnLAB2BfR+/sY4WhwUDJObXwR47kU6fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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