Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8933eff22e497dacb974db647206174e7df11e75092e9d79536acd211a733a80' 
  AND token = 'LvGsSrCEF8PVnlnUHntuQmv5UOmzMcbCtCz5kA6JEwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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