Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8dd9faf35f91dd40c72326d45233f85b7de9c5f3b62ed2f8a392b76dfdc4ae6' 
  AND token = '9buPgFTUDVcfqnqE7iYA2l1s9yetzFGb2vQQTHdpGl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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