Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a8b78b9fc17dbf83beb4a9fe29bf4110b98f89e3693505c5c0679ee80efbc5' 
  AND token = 'Np9Wt8FjNkdsd4qd7HDyeYq8C0dshypC0OlK6bTzdR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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