Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7a33a71b35b0a4fd9dcf7072499b253c624be87a45c834bb6bc5ad2f455a85' 
  AND token = 'rgtEjZOa7eVnsgpAmwErVmQ/G8ZM5eRULB5eQDderD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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