Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c834cac3754e2aaec2a4da31c5c9100892f683d0bb01316fecea0bcda325c8ca' 
  AND token = 'zdI7Sq2vy1OlQHmxxAw/BFZcr6cjKFCnTbCW4teRNtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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