Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1326e3fb921023d5dca0087148de4e21e9df2dcdd32152fa4093b5486dc6f34d' 
  AND token = '79Y7N5dixSMKf4ervE+5P4DH7AcVFWHzN5tQPAYKk0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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