Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791d970e6477f6c89057e5362826bfc4120e049566ec9e3ea87110e831b5728d' 
  AND token = '0NSfOBtIdNyUCY985vEfdkf6M9Td9heSCJQrw6kcHlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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