Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd684e419499c2d1735f0019ca6ecf711c11a27c4ce9905d8e8a8ffc196f100' 
  AND token = 'NZELN/DDYar/NH68bNe1auF8JDF3VjSPEa1NjCQ3WMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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