Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71509ac18a34be8e1d7346e6fc77c45ce5561be3d36aa8c5ba74f83b13d24fa' 
  AND token = '8eK6zd6PjdVuYWVt1R4Wq+ZeBpnN2unl2WJY4BF7DJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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