SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '05193c93e12770144b7aec2f5d6faf5285ba8a39daa805f66c5d306fd83b8543' 
  AND token = 'py+yUZ3hgaV3U1vDcKAK6T6TDgJsMletL7QOUmqijkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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