Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7eb1aa8db15cb7a0da9cc6260b9ddff1fbf19a3c3c150ebbafbfeb0c46d5a4' 
  AND token = '3uScvnZcXnrG8NWYO9D9MQ79rwjElBo/S0duaB//uk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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