SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4bfd20219f97b41f96d4840c99086ff06db73bef14c660fe99814236c702d452' 
  AND token = '5UF8x2ettUSmOVWys01ABF2t/rOnC7IwKovOwZgpjgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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