SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a855f390bbbf210fc799c21c73a8c97ee66a0c73d833a824ab0c7fd4055455f3' 
  AND token = 'ZvKkZCneZVTorX6fiGGj/CcQFLh1MzZMN9JpL+234+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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