Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56fb71a4ddab2edecfaa6cbefb0a4e3b05e21fd326d9a7abde8bc2f5947f8214' 
  AND token = 'f5DlnAVRms+v+tjbwPXTxQJCRYVkKJrUwAFbIfzuUbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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