Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44be41250ea6299d0963ff7f47042376ba6811e5e63b6dad2a89a3337e18d28d' 
  AND token = 'L+fsKlTka5Ab1AbfViwLfrZCfjfDIRkeUlgjRwMvARo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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