SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '36e99b95106dd15c1f41834308414363ed729729f932d8cfc9c6dc576982f301' 
  AND token = 'jt4Bwgml/1h+kXDgCG6pLsnuXKgDLtptOVTu34XOYzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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