SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2e0fa7ec92ac49d96081889d26cb53ba681dd77efeb26f0f5b4f315a4c74ed35' 
  AND token = 'X2wgu3HoxLABl6Jb+QFSsWEmMwiG9tixGeLenDhlRtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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