Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e4a3ea2af37496bb6bdf443a1c7226ba9c08d6602b9683b79b0a02d7ecbbd90' 
  AND token = 'EfMjX+E8avYpEFupso4OT3x6kVIGGgmIci/hqlWuuy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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