Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c834001bb4bede568e261cb4f53bd5a1f48e1784778835f581ac5afe647172e' 
  AND token = '8QRmCOLOA1NEJaM9Pl5SMPNliTeSF3e68vkuXc+hZjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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