SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '76cb0601ab3d58505e38843f131715af5c9297900e5696ea0516c0c7de0518a2' 
  AND token = 'XLF2mMPNV5mO9Wf+vd6PZkS6zBuHp7J82/ba/3fgfhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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