Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bbf7e44f5db1374cc624e7d346d1e0296dd5072e919bc510894ab677cac337b' 
  AND token = '5Kjs+/pv9ZzwstpveECj4JyRvUmA9NVVCyWauvLed7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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