Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0cf66c8eae06a4a124bea30993f9ceb7ce9ae9848f22ca55b00ed0bc55929c' 
  AND token = 'LOnoT/T5fdqu1SkFmNtGvE6D4AxD4ELgWVb252QvPKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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