Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852e8e6d0eb02a4946c5b6d0a6c5aa00292fe5a4e9d82e6cac91bef93dcfbb18' 
  AND token = 'g/+VB+AGlgQtLWVnZUZJvA+qyR5dmnaZMQmDAucuVH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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