Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b746ac0f4a24b6e3ba6db71bccb0fc9c73f83bd4f22ab4c90376c0dee58d6bbe' 
  AND token = 'ZMvJLpyLDAXx5PmS9gLUogUlv4RVUMBzRCDaMeVJa9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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