Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb99b184d63ceeb5ab6dae0319a497be84e1b3c8844330326ed741e6d2cc51cf' 
  AND token = 'zazoXFkhtS5UNCwo9rhZkJiJdm+miVG3CsEQz3h3W8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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