Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b2dffada013f91db2483fc88df264e2b9abf5a9dd8e6ae48218788ad12e051' 
  AND token = '8fMS3w213zHLBlOhntRzT4+YmClyF1VVIijXYJYp75E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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