Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c3e1df91068b4630853d66c000e21ac954c4696ff5042dc0f12ff25c67922a0' 
  AND token = '5qbbHQ/US1dw3mQdWMTfTQxv2KdQtUXMfDUzULhjTlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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