Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878d915a9f61018ee15bb0b5ff649676e6b912b0c266d279b92d401b80b40768' 
  AND token = 'hpJWUpqNZBot1C/ez3A8uNbJigE76dzVhfCPT3z8THc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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