Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669e5e9d5f647574e7b5eb0ebf2e2aa48b330195e362bf498f073fbc2f31edc0' 
  AND token = 'NunU5UoUhIf/HjUCsvnpWH+jR4dmaTOCKuSoPVftPLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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