Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df39ab41d319a5205b9f76b8d87d06e1e145c28e4779dc3f974719d8ec25f1b' 
  AND token = 'CJCsqRXxyLijakIW4IU5FQTRkdiwSn4E/iJW8qY8BkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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