Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c352f6e85c4568ccd9c8d2d915d251fd354e94a7d9a9fbd9095adb7b57f6d1eb' 
  AND token = 'H0pfnZgWh8GTn8KawyT1ARrueuiQlzbpMVawXIlusB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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