Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2a593e952a97a4eed350147812c21ad0e4780e871fcc6c9a00c5f32cc0abc3' 
  AND token = 'lZ9FlDswt4KVWl6w1ZtSM7pJpytz6tYFREZ0POJqEXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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