SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1b23015ed8d7f428b2280e9b3676c88133315aa06b6443d32ae71c69340fe4a0' 
  AND token = 'oKBQzgFbxMInozNqvk+B6YkL0Ys+Rgn7CpHacN5gOu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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