Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d73866975796e4ed903d35871e0f867ba7c54e74f11146b02a8c6cbdba6af4' 
  AND token = 'PZ98Dj4ruhKBWI7l154xY8aFgKTKqHI38Lr6SVKbIcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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