Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c5d5b9c3b6b5f87df0b3d0f41d24bd85c39f9001b27ba104cb23d0f0802b540' 
  AND token = 'r+cFrXyWHsBOZIdBVwtNntY06LbeQ7qYq9W4RVbOh0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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