Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a779a8b59a5b2fdd9eabcf7f1d25fce8f6d5443878fbddf807ce990e69a2d408' 
  AND token = '1lBwa0Z4vwMj10yuc8ibkKFaVu6EO28kbh50DIgqxGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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