Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5f83893243e05453659778d605b315c613f1d778df801e35159590e9b2bd8e7e' 
  AND token = 'z1BtkOZpqbocIsLgMGvSeBHkwnbysS1a1gOeNHD7+sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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