Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76ad236a9da7fd9e5b380fe1288ba60ddf60321d51d788c4ba787be91a6e204' 
  AND token = 'Q+78Ir5Lbmtmgl5NBnZYUxyoRdFr8C3ZERaIYZ+uJWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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