Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ec6df256e8cc8ba6aeb2009657ad80d2daf0ac830d108a98e5262fd55dfaa7' 
  AND token = 'Dx6xOw0nhJHTLZxNmiC+guOCJYeU6R2kmpRRKq7cbO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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