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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '34592e577b8f0309cb14ec7c88659b69f84f7e1c011d91d82957cf60d569e4f9' 
  AND token = 'MapfKtWhM4UYasgQO8k1KKvG2WxbKisK7CZpIya7QOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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