SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fb497eb28a7451e931ad297f19a0761ca84728d1644087608c92bd12f3b8bb66' 
  AND token = 'bdqsmDTMs0UJ/9WJwwel7KzgSKyGLajJjxK0OQ0V9yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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