Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ca03d723baa66be1dcd713afcf00b4a969d1a8b3a118337235dc7412623812' 
  AND token = 'y0slJd8fGxjDdW0DHmLCwPM8B4FTIwFBQsen6ajaQxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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