Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3c71816eaa901beca88e8d88f68aaab9e9e5bbd7aea881a68087b31e03dd30' 
  AND token = 'XCBjbMQLF+HY/VwNkZq0uCaJ/6KM9xG5fWm5F7NM/78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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