Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b3bb1bec87d54b908cf6cb5cfecb7e1eb88f6b1e6e6b9c3e7efb0fcfa958f9a' 
  AND token = 'toW0jNjTjvZghwriPdjhZOpPjd+SDHrU5pmNvppkQk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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