SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'daf8abe1d887d1461583e3fe82c5392f03276bf02753c9cb2745bd7374ab37bf' 
  AND token = 'OiOjw7H15klYE9+4JROBVu6yeiILUj+K+zA4lQ/pnS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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