SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2b70356d175322251e4b289c72e4f16d325f727a9500b632cb5579cd6129884e' 
  AND token = 'Kq5ZbaS19WoPIK0xrpF5AmXy/w4NJFuviHZ3Uh2QV9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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