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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a1652e53dfff8c17892a4c075044e20ad60a718a04677544c8e8ae8df4a24b05' 
  AND token = 'bFGDHcjeiBNiZLgfSai5jBv0DwEfDpxWnHHZXA10Q8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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