Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e55455d0d639d0800e24c8764537b91bfa3d1b97b988071abdab43efcb73184' 
  AND token = '/3ZqkUQvNBZ0boRdeQfS8tC2OwpQ+6XjDY0oNjLCzf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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