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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a3c15c13be63d00a25551b6d726150f53265eee79dc03d79c436a1b1494906a4' 
  AND token = '99NBykytVc9K8BoqHUZw0NB773czQGqYOeiNgKMtK5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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