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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3b26c17e4ca8cf5dc1d5a5af04f240d344c8957b5f8b71717ed2d0ea73f57005' 
  AND token = '1oQdi9pReQnsBthy9KyWwUn5sFMnYmV/CHTcrBaEz9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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