SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b530610e2c4129bbd7fa23d563d45fb4475eb467d8768a06e39cede262330661' 
  AND token = 'TwnKl1fjCOmaYgWRVhZgoQPmLd4Zpue1vVmLXUkVp9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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