Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6f14603227b1faf75cb705b1ad888c182847a6e213341921bcdeccf527955f' 
  AND token = 'slQrmUjPVM2UvTeniJpDfZQsdjzeguTM+EROcdyTeQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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