Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc322125cc59b8f9858b376f17a152c433f82048c12bd0de09f671a22acbc6c' 
  AND token = 'r6ZkLI656NKmsV6ZLOT5xHtfYh/sOTdEKSH37oj0YzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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