Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052063bba87069231319b19a811395675ff2a3434af9e200a5a1bd7ce17ad688' 
  AND token = '28dU4+ujgT7ogI1J9jDzbdguYQpS9WFUCBSVExgP9fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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