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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '99da4ffd963cec1e96a3b548fcfde993ef4aa5b248696d2257bec4e71b66a299' 
  AND token = 'SCvtGO1UCxuB62Z12TTrsX50JoHBBb7DFwdgO9wB1MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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