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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '16c673601c0303ca6f5242b40b786632b2dc081695f85bd8e55ea6a10eb1c78d' 
  AND token = 'kybjvNf18OhpcJxTcObf9pHcm3MDrFylue76Jn+xMDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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