Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d3ad783c96aa86844af9c0dadd138e04e5d523d5e6877c1b57b643bd0a2d46' 
  AND token = '/dIovgRAEvx3rVxAjIscv1Y69ns9KdoyA+owMiy9bmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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