Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6aa6329f7b8d7e09314fffc3a1383bd3c330da5e45353a8678948dbea84451d' 
  AND token = 'JaqEfrGB8W9oRsPoabSa4Zk9qYC/Io4epjQFkaR9ZaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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