Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3009ffc287b73ab57accfdcad36d2496cc488ed9a73710892134b1d9068bf5ed' 
  AND token = '76wLlxFwA1heSFBQPzHBZ30oXC3cRpJDT7TFZ3FXLBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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