SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '569b6f5b501d706f67e4f8b2df93fa9687e1764105954f430e997c5b2e23a4f8' 
  AND token = 'YRDpf2Ch5chQP3Mw3IH0bBXLx1TiTPjOkLGJ+qwRdGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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