Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04461b1c1421e9a94d3d4b95af69e0a4c7ad6b0857a273c8701aa1a5076332b9' 
  AND token = 'tdmXmdLt9nHy0I5KTZphQPDCdYWrPl31rRA2hV+j6AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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