Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6fc9f4393934b39cc98f1d83c97ff32b49c0c271b6aa8c44bf8b98c6862aae' 
  AND token = 'mm/UBMmXxy+4yXeJ29OriXxYQZ30GzaNGYsChIqvrm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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