Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf20322f680fdf67a72fee1bfe8956052e699ca40b1f57a58579f82e5d56fce0' 
  AND token = 'OQXd7cpPhQ8insrt1PRREvsdua3sixUzXMZwgg2ZQNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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