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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bea659b1da3b1eed12b65f71bcd61bffee72bc40c1ed7ae0167099e76c0eb333' 
  AND token = 'ewTYTiZoYp+DFVofjHcTxQTvNASDgqB6eiV2dOxKFus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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