Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8b909966c60f914549adb9433e114a888722eba48168740d90a7910049d916' 
  AND token = 'PyIMb4/8WHGajCAqTGAc8W54KVixmuAl9ZOnDey09RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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