Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9810009e250c442eeda5b98f71ca324623735edf2df7300b11cd3949d5f9ff9e' 
  AND token = 'OnV3flMywEF0mbLNiTQkefdYDzp1O6JZyGrObECasgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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