SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dafe281cd6cfd01eb8cdb546fd7c9fd115223a13d13ef628485035e43ab500ca' 
  AND token = 'XByIoWaYcwuaDo7iggvvJqApFM5mPIUj6YJaF75+2fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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