Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4cf10ee6715fe124c9dd2495d7283b3db95e1cb3cc0cfba61679a5b74603831' 
  AND token = 'waPwkhOrlKDPXkW4pd3WIodfF4RMiq8a+ate30hDkOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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