Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af2afe5849c4dea7c4eb0f1b6cda0d2ad677d0013ad523a62e8491ef9e084f8c' 
  AND token = 'DiJlHv7RSN3eplLn0+Gf0KgerKIIdGlgZI79Y5bmj5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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