Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b6c3f6c0f75c983580f088f0d2793187b650b9e8a485ff9127d3d8cb502fabd' 
  AND token = 'rfiQoVQAURR7Dzb6nqIdY6pSGuWiUDJUmj05/OVFxzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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