SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0622152bd14570c0b059bee3664091bd0cc227f44df630fe6117a1ecc49167d4' 
  AND token = 'SmTOUYzOimNh9yXnfWEVp8vF05vQg6HloQ5/uGvbnec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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