Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '423e851ddd0aee43ed0e825c3411788f667462fc7cc9a636659392ff092e8ab8' 
  AND token = 'VwsnBCty3nlsf3jIaRd+EIDkjhX8pjxk5mOmxP45mw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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