Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336ee47d3a774d43fa9b1ed5256f936dfd58bb07fe8f1ce3f7a8db8fd4f1416a' 
  AND token = '26ZolC7mg46QgIhoEgUCsdhzqOJ7KoNgYoSQcRNj5UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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