Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c643a645346bb235f4cd7ffb930757d351fb36b65de579abdaf9c0af85a83a52' 
  AND token = 'HugBFp6UER3ymZA7M28/vt0qZya/wQO5sbPZv2JtCAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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