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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8db8951178b8a89341505eabd5606b3998cfd2f27d07378911b100eb0ac59de3' 
  AND token = 'q3CEOLWttNLl/70C8N+DZh3AxLAHmkHHiezaPpbjezA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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