Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '331452fdaef2fbf27e4f483835e4d4a81a91b671e1311b4973a5610dba97b3f2' 
  AND token = 'cRCAOl7+MDIRFgLwZTGUI8T2om7sR0DdL8K6K9IP8w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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