Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b0f013a0a3b7c196347b98fea551c3cddd22ec61dba91fa4ab0f3c0e8289d58' 
  AND token = 'CLhlfj1J3U9ecbOciQTlf1Y3hICjVrgPJrW+rUIz2Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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