Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a85ef0a20f85f9453f77d7ce7ec7fc9e3deba38f5194b6857f174f5f53e57b' 
  AND token = 'HbTiPxZ6U7f86anTdvhJMKBMnRM9A0ZEG2mbs4fgnWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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