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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '08677e1fd696e0b434d8d49eb9c15889ccc5deb8db4e358940645926b3aea4c0' 
  AND token = 'hz0dsNeFeP6DFXQSci87LbiK1eSOGgKEz9qUyoz78NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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