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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '381f712d2d857fb34a68b4bcb4d001e1ca35c923bcd41d6d9b8b825f6f75d08b' 
  AND token = '1xN47W+hMwaIOIue9SWH9g5I6B232T40cXal1f9O4QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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