Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af0654aa9ed0e2effff569bfdf72a798cbddda6b3f2e26bc78ed9dde24ce48de' 
  AND token = '9245/z0iRSXtIgZxrzfGDaT4Xc46AsdG0pW0Rx0Mjtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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