SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '567ab2cc245d1a06814aee159427d1aca310360d9a1069935d8ccf9ee1baec02' 
  AND token = 'iAZUssOhOrubSwfvm3tdLPChFJfT7NKDFvgh24K2M8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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