Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7588107d1c13191f52402d38050317e8917bc4ea491931cf3a3cdf56abfcf5' 
  AND token = 'uYmMYwXR770VKI2kOp1ZkY92RAiGaFj4oeHBFNMl1gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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