Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac28cd7a37a34d04aab8d4defd947d45e2402d30ed6bdab13b21a07274ef19e' 
  AND token = '3MvFJTZVFyJrmKXRhPGWtq2k2O1KArVhNcpQoiajlwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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