SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '002aa2e5f554e667170be02d851323d3178dd8d1f30f3d33d439abe0d82dce33' 
  AND token = 'hFTfV62Kw1qfWM/yU1KYTVinzA92/OfnDU8LuEgzjvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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