Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec55b41e763696c0c4f861799b79ac38ab6b1d166e2516268d3023cdb70f7599' 
  AND token = 'Xkkm8cUR7hgULNvZTDG5L/PU9F9AlUXVHrSN/QLYATY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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