Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13013cf9f4ce5158f64a5aeb13b03add12a466dcd5907ad31235e1ee8852d93' 
  AND token = 'KtAiEj+QzMz9jNhSxS04bKJFX7AqCaxqhOhrJpXu4jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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