Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bdcbd676a4b9474c628962475c7da934151b9569dd37457febea22ddf221d4a' 
  AND token = '1YQDnDa8GYC2MzrMJGIEletrvDkgNGZNHMuyGs/oMEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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