Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6f868fe1a95ff2848361ce7e4f1c2ec711d77975d6047fed90135dedd654a0' 
  AND token = '92ZvOvjFvqFf6qPpDBZcyMOrcLsMwOWWyGc3ATENz0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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