Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9aa52cdc93889ae76f05dd7cd4cbb09e3a424b32b344b7320faafe9fee1dd8' 
  AND token = 'RPFUFrHLFQoQh6/tFpewfqGb9rbQTORTzc9yxsEd+dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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