Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c7f7bf05f41810dae16b0bf7bc7d80eaa1161c8a74a8b9b1166f54e4eb9432c' 
  AND token = '378r9jo7wMeBFalxEHD6fNU8pLdKNQ4mrzT21YU4xeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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