Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f89e10421a6af813161bbaf378c512aa2f7d68f3e99b7a13c00e1a2c0d0404' 
  AND token = '0mx5GH6V8iiMlOUps3xC1A2jTNJc7lVeqmVIbH5T64w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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