Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '921036608948990e71c3a2d406975a8b8abe08db163ae2467cb7c2e7c8fb3628' 
  AND token = '4gCOFtHrjJocQ5Kgt+6orIJ+Bqa+MqIJoz7hQhP0wiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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