Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ae691173448b8e9218a396d260c6a1d812b33c7cde8784edcb99d1d9b81550' 
  AND token = '0LphDUi7f8OJSsc04wVNmXbjgYTplcSnmxKTM7ag5pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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