Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6ecd7101e7cde4ac1975cf7170947cf3acbb9f1a0f555286bdb6b16d666f9c' 
  AND token = 'MHXcxmCiHPWO/0d6srKMicWttvSaAATsVp/Ksr+uVfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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